#!/usr/bin/env bash
set -euo pipefail

# Run VM-mixed (512KB–<2MB) bench across allocators and L25 A/B, save CSV.
# Usage: benchmarks/scripts/run_vm_mixed_matrix.sh [cycles] [ws] [reps]

ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")"/../.. && pwd)"
cd "$ROOT_DIR"

cycles=${1:-20000}
ws=${2:-256}
reps=${3:-5}

outdir="bench_results/auto/vm_mixed_$(date +%Y%m%d_%H%M%S)"
mkdir -p "$outdir"
csv="$outdir/results.csv"
echo "ts,scenario,allocator,env,cycles,ws,rep,throughput_ops_s" >"$csv"

run_case() {
  local scenario="$1"; shift
  local alloc="$1"; shift
  local envstr="$1"; shift
  local bin="$1"; shift
  for ((i=1;i<=reps;i++)); do
    local ts=$(date +%H%M%S)
    local out
    out=$($envstr "$bin" "$cycles" "$ws" 4242 2>/dev/null || true)
    local tput=$(echo "$out" | awk '/Throughput =/{print $3; exit}')
    if [[ -n "${tput:-}" ]]; then
      echo "$ts,$scenario,$alloc,$(echo "$envstr" | sed 's/,/;/g'),$cycles,$ws,$i,$tput" >>"$csv"
    fi
  done
}

# Build benches if needed
[[ -x ./bench_vm_mixed_system ]] || make -s bench_vm_mixed_system >/dev/null
[[ -x ./bench_vm_mixed_hakmem ]] || make -s bench_vm_mixed_hakmem >/dev/null

echo "[info] writing CSV to $csv"

# system
run_case "vm_mixed" "system" "env -i" ./bench_vm_mixed_system

# HAKMEM L25 OFF/ON
run_case "vm_mixed" "hakmem(l25=0)" "env -i HAKMEM_BIGCACHE_L25=0 HAKMEM_WRAP_TINY=1" ./bench_vm_mixed_hakmem
run_case "vm_mixed" "hakmem(l25=1)" "env -i HAKMEM_BIGCACHE_L25=1 HAKMEM_WRAP_TINY=1" ./bench_vm_mixed_hakmem

echo "[done] $csv"